changeset 4314:f3645b5d6e62

Merge
author asaha
date Wed, 20 Apr 2011 21:24:26 -0700
parents 6f8a4d334fb2 d5a7ed4e72a4
children b626f78c57e1 cec45f3353be
files
diffstat 11 files changed, 206 insertions(+), 117 deletions(-) [+]
line wrap: on
line diff
--- a/src/share/classes/java/util/AbstractSet.java	Wed Apr 20 09:31:11 2011 -0700
+++ b/src/share/classes/java/util/AbstractSet.java	Wed Apr 20 21:24:26 2011 -0700
@@ -156,9 +156,11 @@
      * @throws UnsupportedOperationException if the <tt>removeAll</tt> operation
      *         is not supported by this set
      * @throws ClassCastException if the class of an element of this set
-     *         is incompatible with the specified collection (optional)
+     *         is incompatible with the specified collection
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if this set contains a null element and the
-     *         specified collection does not permit null elements (optional),
+     *         specified collection does not permit null elements
+     * (<a href="Collection.html#optional-restrictions">optional</a>),
      *         or if the specified collection is null
      * @see #remove(Object)
      * @see #contains(Object)
--- a/src/share/classes/java/util/ArrayList.java	Wed Apr 20 09:31:11 2011 -0700
+++ b/src/share/classes/java/util/ArrayList.java	Wed Apr 20 21:24:26 2011 -0700
@@ -628,9 +628,11 @@
      * @param c collection containing elements to be removed from this list
      * @return {@code true} if this list changed as a result of the call
      * @throws ClassCastException if the class of an element of this list
-     *         is incompatible with the specified collection (optional)
+     *         is incompatible with the specified collection
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if this list contains a null element and the
-     *         specified collection does not permit null elements (optional),
+     *         specified collection does not permit null elements
+     * (<a href="Collection.html#optional-restrictions">optional</a>),
      *         or if the specified collection is null
      * @see Collection#contains(Object)
      */
@@ -646,9 +648,11 @@
      * @param c collection containing elements to be retained in this list
      * @return {@code true} if this list changed as a result of the call
      * @throws ClassCastException if the class of an element of this list
-     *         is incompatible with the specified collection (optional)
+     *         is incompatible with the specified collection
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if this list contains a null element and the
-     *         specified collection does not permit null elements (optional),
+     *         specified collection does not permit null elements
+     * (<a href="Collection.html#optional-restrictions">optional</a>),
      *         or if the specified collection is null
      * @see Collection#contains(Object)
      */
--- a/src/share/classes/java/util/Collection.java	Wed Apr 20 09:31:11 2011 -0700
+++ b/src/share/classes/java/util/Collection.java	Wed Apr 20 21:24:26 2011 -0700
@@ -60,7 +60,8 @@
  * but is not required to, throw the exception if the collection to be added
  * is empty.
  *
- * <p>Some collection implementations have restrictions on the elements that
+ * <p><a name="optional-restrictions"/>
+ * Some collection implementations have restrictions on the elements that
  * they may contain.  For example, some implementations prohibit null elements,
  * and some have restrictions on the types of their elements.  Attempting to
  * add an ineligible element throws an unchecked exception, typically
@@ -152,9 +153,11 @@
      * @return <tt>true</tt> if this collection contains the specified
      *         element
      * @throws ClassCastException if the type of the specified element
-     *         is incompatible with this collection (optional)
+     *         is incompatible with this collection
+     *         (<a href="#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified element is null and this
-     *         collection does not permit null elements (optional)
+     *         collection does not permit null elements
+     *         (<a href="#optional-restrictions">optional</a>)
      */
     boolean contains(Object o);
 
@@ -279,9 +282,11 @@
      * @param o element to be removed from this collection, if present
      * @return <tt>true</tt> if an element was removed as a result of this call
      * @throws ClassCastException if the type of the specified element
-     *         is incompatible with this collection (optional)
+     *         is incompatible with this collection
+     *         (<a href="#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified element is null and this
-     *         collection does not permit null elements (optional)
+     *         collection does not permit null elements
+     *         (<a href="#optional-restrictions">optional</a>)
      * @throws UnsupportedOperationException if the <tt>remove</tt> operation
      *         is not supported by this collection
      */
@@ -299,10 +304,13 @@
      *         in the specified collection
      * @throws ClassCastException if the types of one or more elements
      *         in the specified collection are incompatible with this
-     *         collection (optional)
+     *         collection
+     *         (<a href="#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified collection contains one
      *         or more null elements and this collection does not permit null
-     *         elements (optional), or if the specified collection is null
+     *         elements
+     *         (<a href="#optional-restrictions">optional</a>),
+     *         or if the specified collection is null.
      * @see    #contains(Object)
      */
     boolean containsAll(Collection<?> c);
@@ -346,10 +354,13 @@
      *         is not supported by this collection
      * @throws ClassCastException if the types of one or more elements
      *         in this collection are incompatible with the specified
-     *         collection (optional)
+     *         collection
+     *         (<a href="#optional-restrictions">optional</a>)
      * @throws NullPointerException if this collection contains one or more
      *         null elements and the specified collection does not support
-     *         null elements (optional), or if the specified collection is null
+     *         null elements
+     *         (<a href="#optional-restrictions">optional</a>),
+     *         or if the specified collection is null
      * @see #remove(Object)
      * @see #contains(Object)
      */
@@ -367,10 +378,13 @@
      *         is not supported by this collection
      * @throws ClassCastException if the types of one or more elements
      *         in this collection are incompatible with the specified
-     *         collection (optional)
+     *         collection
+     *         (<a href="#optional-restrictions">optional</a>)
      * @throws NullPointerException if this collection contains one or more
      *         null elements and the specified collection does not permit null
-     *         elements (optional), or if the specified collection is null
+     *         elements
+     *         (<a href="#optional-restrictions">optional</a>),
+     *         or if the specified collection is null
      * @see #remove(Object)
      * @see #contains(Object)
      */
--- a/src/share/classes/java/util/Collections.java	Wed Apr 20 09:31:11 2011 -0700
+++ b/src/share/classes/java/util/Collections.java	Wed Apr 20 21:24:26 2011 -0700
@@ -3746,9 +3746,10 @@
      * @throws NullPointerException if either collection is {@code null}.
      * @throws NullPointerException if one collection contains a {@code null}
      * element and {@code null} is not an eligible element for the other collection.
-     * (optional)
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws ClassCastException if one collection contains an element that is
-     * of a type which is ineligible for the other collection. (optional)
+     * of a type which is ineligible for the other collection.
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @since 1.5
      */
     public static boolean disjoint(Collection<?> c1, Collection<?> c2) {
--- a/src/share/classes/java/util/Deque.java	Wed Apr 20 09:31:11 2011 -0700
+++ b/src/share/classes/java/util/Deque.java	Wed Apr 20 21:24:26 2011 -0700
@@ -351,9 +351,11 @@
      * @param o element to be removed from this deque, if present
      * @return <tt>true</tt> if an element was removed as a result of this call
      * @throws ClassCastException if the class of the specified element
-     *         is incompatible with this deque (optional)
+     *         is incompatible with this deque
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified element is null and this
-     *         deque does not permit null elements (optional)
+     *         deque does not permit null elements
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      */
     boolean removeFirstOccurrence(Object o);
 
@@ -369,9 +371,11 @@
      * @param o element to be removed from this deque, if present
      * @return <tt>true</tt> if an element was removed as a result of this call
      * @throws ClassCastException if the class of the specified element
-     *         is incompatible with this deque (optional)
+     *         is incompatible with this deque
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified element is null and this
-     *         deque does not permit null elements (optional)
+     *         deque does not permit null elements
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      */
     boolean removeLastOccurrence(Object o);
 
@@ -527,9 +531,11 @@
      * @param o element to be removed from this deque, if present
      * @return <tt>true</tt> if an element was removed as a result of this call
      * @throws ClassCastException if the class of the specified element
-     *         is incompatible with this deque (optional)
+     *         is incompatible with this deque
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified element is null and this
-     *         deque does not permit null elements (optional)
+     *         deque does not permit null elements
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      */
     boolean remove(Object o);
 
@@ -542,9 +548,11 @@
      * @param o element whose presence in this deque is to be tested
      * @return <tt>true</tt> if this deque contains the specified element
      * @throws ClassCastException if the type of the specified element
-     *         is incompatible with this deque (optional)
+     *         is incompatible with this deque
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified element is null and this
-     *         deque does not permit null elements (optional)
+     *         deque does not permit null elements
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      */
     boolean contains(Object o);
 
--- a/src/share/classes/java/util/List.java	Wed Apr 20 09:31:11 2011 -0700
+++ b/src/share/classes/java/util/List.java	Wed Apr 20 21:24:26 2011 -0700
@@ -134,9 +134,11 @@
      * @param o element whose presence in this list is to be tested
      * @return <tt>true</tt> if this list contains the specified element
      * @throws ClassCastException if the type of the specified element
-     *         is incompatible with this list (optional)
+     *         is incompatible with this list
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified element is null and this
-     *         list does not permit null elements (optional)
+     *         list does not permit null elements
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      */
     boolean contains(Object o);
 
@@ -245,9 +247,11 @@
      * @param o element to be removed from this list, if present
      * @return <tt>true</tt> if this list contained the specified element
      * @throws ClassCastException if the type of the specified element
-     *         is incompatible with this list (optional)
+     *         is incompatible with this list
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified element is null and this
-     *         list does not permit null elements (optional)
+     *         list does not permit null elements
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws UnsupportedOperationException if the <tt>remove</tt> operation
      *         is not supported by this list
      */
@@ -265,10 +269,13 @@
      *         specified collection
      * @throws ClassCastException if the types of one or more elements
      *         in the specified collection are incompatible with this
-     *         list (optional)
+     *         list
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified collection contains one
      *         or more null elements and this list does not permit null
-     *         elements (optional), or if the specified collection is null
+     *         elements
+     *         (<a href="Collection.html#optional-restrictions">optional</a>),
+     *         or if the specified collection is null
      * @see #contains(Object)
      */
     boolean containsAll(Collection<?> c);
@@ -334,9 +341,11 @@
      * @throws UnsupportedOperationException if the <tt>removeAll</tt> operation
      *         is not supported by this list
      * @throws ClassCastException if the class of an element of this list
-     *         is incompatible with the specified collection (optional)
+     *         is incompatible with the specified collection
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if this list contains a null element and the
-     *         specified collection does not permit null elements (optional),
+     *         specified collection does not permit null elements
+     *         (<a href="Collection.html#optional-restrictions">optional</a>),
      *         or if the specified collection is null
      * @see #remove(Object)
      * @see #contains(Object)
@@ -354,9 +363,11 @@
      * @throws UnsupportedOperationException if the <tt>retainAll</tt> operation
      *         is not supported by this list
      * @throws ClassCastException if the class of an element of this list
-     *         is incompatible with the specified collection (optional)
+     *         is incompatible with the specified collection
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if this list contains a null element and the
-     *         specified collection does not permit null elements (optional),
+     *         specified collection does not permit null elements
+     *         (<a href="Collection.html#optional-restrictions">optional</a>),
      *         or if the specified collection is null
      * @see #remove(Object)
      * @see #contains(Object)
@@ -493,9 +504,11 @@
      * @return the index of the first occurrence of the specified element in
      *         this list, or -1 if this list does not contain the element
      * @throws ClassCastException if the type of the specified element
-     *         is incompatible with this list (optional)
+     *         is incompatible with this list
+     *         (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified element is null and this
-     *         list does not permit null elements (optional)
+     *         list does not permit null elements
+     *         (<a href="Collection.html#optional-restrictions">optional</a>)
      */
     int indexOf(Object o);
 
@@ -510,9 +523,11 @@
      * @return the index of the last occurrence of the specified element in
      *         this list, or -1 if this list does not contain the element
      * @throws ClassCastException if the type of the specified element
-     *         is incompatible with this list (optional)
+     *         is incompatible with this list
+     *         (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified element is null and this
-     *         list does not permit null elements (optional)
+     *         list does not permit null elements
+     *         (<a href="Collection.html#optional-restrictions">optional</a>)
      */
     int lastIndexOf(Object o);
 
--- a/src/share/classes/java/util/Map.java	Wed Apr 20 09:31:11 2011 -0700
+++ b/src/share/classes/java/util/Map.java	Wed Apr 20 21:24:26 2011 -0700
@@ -144,9 +144,11 @@
      * @return <tt>true</tt> if this map contains a mapping for the specified
      *         key
      * @throws ClassCastException if the key is of an inappropriate type for
-     *         this map (optional)
+     *         this map
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified key is null and this map
-     *         does not permit null keys (optional)
+     *         does not permit null keys
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      */
     boolean containsKey(Object key);
 
@@ -162,9 +164,11 @@
      * @return <tt>true</tt> if this map maps one or more keys to the
      *         specified value
      * @throws ClassCastException if the value is of an inappropriate type for
-     *         this map (optional)
+     *         this map
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified value is null and this
-     *         map does not permit null values (optional)
+     *         map does not permit null values
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      */
     boolean containsValue(Object value);
 
@@ -187,9 +191,11 @@
      * @return the value to which the specified key is mapped, or
      *         {@code null} if this map contains no mapping for the key
      * @throws ClassCastException if the key is of an inappropriate type for
-     *         this map (optional)
+     *         this map
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified key is null and this map
-     *         does not permit null keys (optional)
+     *         does not permit null keys
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      */
     V get(Object key);
 
@@ -245,9 +251,11 @@
      * @throws UnsupportedOperationException if the <tt>remove</tt> operation
      *         is not supported by this map
      * @throws ClassCastException if the key is of an inappropriate type for
-     *         this map (optional)
+     *         this map
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified key is null and this
-     *         map does not permit null keys (optional)
+     *         map does not permit null keys
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      */
     V remove(Object key);
 
@@ -466,4 +474,5 @@
      * @see #equals(Object)
      */
     int hashCode();
+
 }
--- a/src/share/classes/java/util/Set.java	Wed Apr 20 09:31:11 2011 -0700
+++ b/src/share/classes/java/util/Set.java	Wed Apr 20 21:24:26 2011 -0700
@@ -110,9 +110,11 @@
      * @param o element whose presence in this set is to be tested
      * @return <tt>true</tt> if this set contains the specified element
      * @throws ClassCastException if the type of the specified element
-     *         is incompatible with this set (optional)
+     *         is incompatible with this set
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified element is null and this
-     *         set does not permit null elements (optional)
+     *         set does not permit null elements
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      */
     boolean contains(Object o);
 
@@ -236,9 +238,11 @@
      * @param o object to be removed from this set, if present
      * @return <tt>true</tt> if this set contained the specified element
      * @throws ClassCastException if the type of the specified element
-     *         is incompatible with this set (optional)
+     *         is incompatible with this set
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified element is null and this
-     *         set does not permit null elements (optional)
+     *         set does not permit null elements
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws UnsupportedOperationException if the <tt>remove</tt> operation
      *         is not supported by this set
      */
@@ -257,10 +261,13 @@
      *         specified collection
      * @throws ClassCastException if the types of one or more elements
      *         in the specified collection are incompatible with this
-     *         set (optional)
+     *         set
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if the specified collection contains one
      *         or more null elements and this set does not permit null
-     *         elements (optional), or if the specified collection is null
+     *         elements
+     * (<a href="Collection.html#optional-restrictions">optional</a>),
+     *         or if the specified collection is null
      * @see    #contains(Object)
      */
     boolean containsAll(Collection<?> c);
@@ -302,9 +309,11 @@
      * @throws UnsupportedOperationException if the <tt>retainAll</tt> operation
      *         is not supported by this set
      * @throws ClassCastException if the class of an element of this set
-     *         is incompatible with the specified collection (optional)
+     *         is incompatible with the specified collection
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if this set contains a null element and the
-     *         specified collection does not permit null elements (optional),
+     *         specified collection does not permit null elements
+     *         (<a href="Collection.html#optional-restrictions">optional</a>),
      *         or if the specified collection is null
      * @see #remove(Object)
      */
@@ -322,9 +331,11 @@
      * @throws UnsupportedOperationException if the <tt>removeAll</tt> operation
      *         is not supported by this set
      * @throws ClassCastException if the class of an element of this set
-     *         is incompatible with the specified collection (optional)
+     *         is incompatible with the specified collection
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if this set contains a null element and the
-     *         specified collection does not permit null elements (optional),
+     *         specified collection does not permit null elements
+     *         (<a href="Collection.html#optional-restrictions">optional</a>),
      *         or if the specified collection is null
      * @see #remove(Object)
      * @see #contains(Object)
--- a/src/share/classes/java/util/Vector.java	Wed Apr 20 09:31:11 2011 -0700
+++ b/src/share/classes/java/util/Vector.java	Wed Apr 20 21:24:26 2011 -0700
@@ -893,10 +893,13 @@
      * @return true if this Vector changed as a result of the call
      * @throws ClassCastException if the types of one or more elements
      *         in this vector are incompatible with the specified
-     *         collection (optional)
+     *         collection
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if this vector contains one or more null
      *         elements and the specified collection does not support null
-     *         elements (optional), or if the specified collection is null
+     *         elements
+     * (<a href="Collection.html#optional-restrictions">optional</a>),
+     *         or if the specified collection is null
      * @since 1.2
      */
     public synchronized boolean removeAll(Collection<?> c) {
@@ -913,10 +916,13 @@
      * @return true if this Vector changed as a result of the call
      * @throws ClassCastException if the types of one or more elements
      *         in this vector are incompatible with the specified
-     *         collection (optional)
+     *         collection
+     * (<a href="Collection.html#optional-restrictions">optional</a>)
      * @throws NullPointerException if this vector contains one or more null
      *         elements and the specified collection does not support null
-     *         elements (optional), or if the specified collection is null
+     *         elements
+     *         (<a href="Collection.html#optional-restrictions">optional</a>),
+     *         or if the specified collection is null
      * @since 1.2
      */
     public synchronized boolean retainAll(Collection<?> c) {
--- a/src/share/classes/sun/rmi/log/ReliableLog.java	Wed Apr 20 09:31:11 2011 -0700
+++ b/src/share/classes/sun/rmi/log/ReliableLog.java	Wed Apr 20 21:24:26 2011 -0700
@@ -380,9 +380,7 @@
             } catch (IOException e) {
                 throw e;
             } catch (Exception e) {
-                throw new IOException("snapshot failed with exception of type: " +
-                                      e.getClass().getName() +
-                                      ", message was: " + e.getMessage());
+                throw new IOException("snapshot failed", e);
             }
             lastSnapshot = System.currentTimeMillis();
         } finally {
--- a/src/share/classes/sun/rmi/server/Activation.java	Wed Apr 20 09:31:11 2011 -0700
+++ b/src/share/classes/sun/rmi/server/Activation.java	Wed Apr 20 21:24:26 2011 -0700
@@ -30,6 +30,7 @@
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
+import java.io.ObjectInputStream;
 import java.io.OutputStream;
 import java.io.PrintStream;
 import java.io.PrintWriter;
@@ -98,6 +99,7 @@
 import java.util.Properties;
 import java.util.ResourceBundle;
 import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 import sun.rmi.log.LogHandler;
 import sun.rmi.log.ReliableLog;
 import sun.rmi.registry.RegistryImpl;
@@ -147,10 +149,10 @@
 
     /** maps activation id to its respective group id */
     private Map<ActivationID,ActivationGroupID> idTable =
-        new HashMap<ActivationID,ActivationGroupID>();
+        new ConcurrentHashMap<>();
     /** maps group id to its GroupEntry groups */
     private Map<ActivationGroupID,GroupEntry> groupTable =
-        new HashMap<ActivationGroupID,GroupEntry>();
+        new ConcurrentHashMap<>();
 
     private byte majorVersion = MAJOR_VERSION;
     private byte minorVersion = MINOR_VERSION;
@@ -236,9 +238,11 @@
         groupSemaphore = getInt("sun.rmi.activation.groupThrottle", 3);
         groupCounter = 0;
         Runtime.getRuntime().addShutdownHook(shutdownHook);
+
+        // Use array size of 0, since the value from calling size()
+        // may be out of date by the time toArray() is called.
         ActivationGroupID[] gids =
-            groupTable.keySet().toArray(
-                new ActivationGroupID[groupTable.size()]);
+            groupTable.keySet().toArray(new ActivationGroupID[0]);
 
         synchronized (startupLock = new Object()) {
             // all the remote methods briefly synchronize on startupLock
@@ -274,6 +278,23 @@
         }
     }
 
+    /**
+     * Previous versions used HashMap instead of ConcurrentHashMap.
+     * Replace any HashMaps found during deserialization with
+     * ConcurrentHashMaps.
+     */
+    private void readObject(ObjectInputStream ois)
+        throws IOException, ClassNotFoundException
+    {
+        ois.defaultReadObject();
+        if (! (groupTable instanceof ConcurrentHashMap)) {
+            groupTable = new ConcurrentHashMap<>(groupTable);
+        }
+        if (! (idTable instanceof ConcurrentHashMap)) {
+            idTable = new ConcurrentHashMap<>(idTable);
+        }
+    }
+
     private static class SystemRegistryImpl extends RegistryImpl {
 
         private static final String NAME = ActivationSystem.class.getName();
@@ -488,9 +509,7 @@
             ActivationGroupID id = new ActivationGroupID(systemStub);
             GroupEntry entry = new GroupEntry(id, desc);
             // table insertion must take place before log update
-            synchronized (groupTable) {
-                groupTable.put(id, entry);
-            }
+            groupTable.put(id, entry);
             addLogRecord(new LogRegisterGroup(id, desc));
             return id;
         }
@@ -515,11 +534,7 @@
 
             // remove entry before unregister so state is updated before
             // logged
-            synchronized (groupTable) {
-                GroupEntry entry = getGroupEntry(id);
-                groupTable.remove(id);
-                entry.unregisterGroup(true);
-            }
+            removeGroupEntry(id).unregisterGroup(true);
         }
 
         public ActivationDesc setActivationDesc(ActivationID id,
@@ -637,12 +652,7 @@
                 unexport(system);
 
                 // destroy all child processes (groups)
-                GroupEntry[] groupEntries;
-                synchronized (groupTable) {
-                    groupEntries = groupTable.values().
-                        toArray(new GroupEntry[groupTable.size()]);
-                }
-                for (GroupEntry groupEntry : groupEntries) {
+                for (GroupEntry groupEntry : groupTable.values()) {
                     groupEntry.shutdown();
                 }
 
@@ -693,10 +703,8 @@
             }
 
             // destroy all child processes (groups) quickly
-            synchronized (groupTable) {
-                for (GroupEntry groupEntry : groupTable.values()) {
-                    groupEntry.shutdownFast();
-                }
+            for (GroupEntry groupEntry : groupTable.values()) {
+                groupEntry.shutdownFast();
             }
         }
     }
@@ -708,13 +716,32 @@
     private ActivationGroupID getGroupID(ActivationID id)
         throws UnknownObjectException
     {
-        synchronized (idTable) {
-            ActivationGroupID groupID = idTable.get(id);
-            if (groupID != null) {
-                return groupID;
+        ActivationGroupID groupID = idTable.get(id);
+        if (groupID != null) {
+            return groupID;
+        }
+        throw new UnknownObjectException("unknown object: " + id);
+    }
+
+    /**
+     * Returns the group entry for the group id, optionally removing it.
+     * Throws UnknownGroupException if the group is not registered.
+     */
+    private GroupEntry getGroupEntry(ActivationGroupID id, boolean rm)
+        throws UnknownGroupException
+    {
+        if (id.getClass() == ActivationGroupID.class) {
+            GroupEntry entry;
+            if (rm) {
+                entry = groupTable.remove(id);
+            } else {
+                entry = groupTable.get(id);
+            }
+            if (entry != null && !entry.removed) {
+                return entry;
             }
         }
-        throw new UnknownObjectException("unknown object: " + id);
+        throw new UnknownGroupException("group unknown");
     }
 
     /**
@@ -724,15 +751,17 @@
     private GroupEntry getGroupEntry(ActivationGroupID id)
         throws UnknownGroupException
     {
-        if (id.getClass() == ActivationGroupID.class) {
-            synchronized (groupTable) {
-                GroupEntry entry = groupTable.get(id);
-                if (entry != null && !entry.removed) {
-                    return entry;
-                }
-            }
-        }
-        throw new UnknownGroupException("group unknown");
+        return getGroupEntry(id, false);
+    }
+
+    /**
+     * Removes and returns the group entry for the group id. Throws
+     * UnknownGroupException if the group is not registered.
+     */
+    private GroupEntry removeGroupEntry(ActivationGroupID id)
+        throws UnknownGroupException
+    {
+        return getGroupEntry(id, true);
     }
 
     /**
@@ -744,11 +773,9 @@
         throws UnknownObjectException
     {
         ActivationGroupID gid = getGroupID(id);
-        synchronized (groupTable) {
-            GroupEntry entry = groupTable.get(gid);
-            if (entry != null) {
-                return entry;
-            }
+        GroupEntry entry = groupTable.get(gid);
+        if (entry != null && !entry.removed) {
+            return entry;
         }
         throw new UnknownObjectException("object's group removed");
     }
@@ -882,9 +909,7 @@
             }
 
             // table insertion must take place before log update
-            synchronized (idTable) {
-                idTable.put(id, groupID);
-            }
+            idTable.put(id, groupID);
 
             if (addRecord) {
                 addLogRecord(new LogRegisterObject(id, desc));
@@ -901,10 +926,8 @@
                 restartSet.remove(id);
             }
 
-            // table insertion must take place before log update
-            synchronized (idTable) {
-                idTable.remove(id);
-            }
+            // table removal must take place before log update
+            idTable.remove(id);
             if (addRecord) {
                 addLogRecord(new LogUnregisterObject(id));
             }
@@ -919,9 +942,7 @@
                      objects.entrySet())
             {
                 ActivationID id = entry.getKey();
-                synchronized (idTable) {
-                    idTable.remove(id);
-                }
+                idTable.remove(id);
                 ObjectEntry objEntry = entry.getValue();
                 objEntry.removed = true;
             }